CN102870367B

CN102870367B - Method and apparatus for control and data multiplexing in wireless communication

Info

Publication number: CN102870367B
Application number: CN201180022233.6A
Authority: CN
Inventors: X·罗; 罗涛; 徐浩; W·陈; 张晓霞; P·加尔; J·蒙托霍
Original assignee: Qualcomm Inc
Current assignee: Qualcomm Inc
Priority date: 2010-05-03
Filing date: 2011-05-03
Publication date: 2015-04-29
Anticipated expiration: 2031-05-03
Also published as: TWI472199B; EP2567494A1; US20110268080A1; US9100155B2; JP2013531407A; JP5869049B2; KR20130028117A; TW201210277A; JP2014209750A; BR112012028009B1; JP5559423B2; CN102870367A; KR101477157B1; WO2011140109A1; EP2567494B1; BR112012028009A2

Abstract

A method of wireless communication includes determining a number of symbols for uplink control information (UCI) on each of a plurality of layers, multiplexing symbols for the UCI with data on multiple layers such that the symbols are time aligned across the layers, and sending the multiplexed symbols on the multiple layers on uplink. In some designs, the number of symbols for the UCI may be determined based on a spectral resource parameter.

Description

Method and apparatus for control and data multiplexing in wireless communications

Cross Reference to Related Applications

The present application claims the benefit of priority from U.S. provisional patent application entitled "METHOD AND APPARATUS FOR MULTIPLE COMMUNICATION SYSTEM" filed 3.2010, entitled "METHOD AND APPARATUS FOR CALCULATING NUMBATIONS SYSTEM IN A WIRELESS TRANSMISSION", filed 16.2010, 8.3.2010, each of which is incorporated herein by reference in its entirety.

Technical Field

The following description relates generally to wireless communications, and more particularly to transmitting uplink control information multiplexed with data on multiple layers in wireless communications.

Background

Wireless communication systems are widely deployed to provide various types of communication content such as voice, data, and so on. These systems may be multiple-access systems capable of supporting communication with multiple users by sharing the available system resources (e.g., bandwidth and transmit power). Examples of such multiple-access systems include Code Division Multiple Access (CDMA) systems, Time Division Multiple Access (TDMA) systems, Frequency Division Multiple Access (FDMA) systems, 3GPP Long Term Evolution (LTE) systems, and Orthogonal Frequency Division Multiple Access (OFDMA) systems.

Generally, a wireless multiple-access communication system can simultaneously support communication for multiple wireless terminals. Each terminal may communicate with one or more base stations via transmissions on the forward and reverse links. The forward link (or downlink) refers to the communication link from the base stations to the terminals, and the reverse link (or uplink) refers to the communication link from the terminals to the base stations. Such communication links may be established via single-input single-output, multiple-input single-output, or multiple-input multiple-output (MIMO) systems.

A wireless communication system may include multiple base stations, which may support communication for multiple User Equipments (UEs). A base station may include multiple transmit and/or receive antennas. Each UE may include multiple transmit and/or receive antennas. The UE may transmit Uplink Control Information (UCI) on a Physical Uplink Control Channel (PUCCH). However, when there is a concurrent Physical Uplink Shared Channel (PUSCH) transmission and only a single layer is available for uplink, UCI may be multiplexed with data and transmitted in PUSCH in order to maintain a single carrier waveform in uplink, if UCI needs to be fed back.

MIMO systems employing multiple (N)_TMultiple) transmitting antenna and multiple (N)_RAnd) receiving antennas for data transmission. May be composed of N_TA transmitting antenna and N_RMIMO channel decomposition into N_SIndividual channels, also called spatial channels, in which N_S≤min{N_T,N_R}。N_SEach of the individual channels corresponds to a dimension. MIMO systems may provide improved performance (e.g., higher throughput and/or higher reliability) if the additional dimensionalities created by the multiple transmit and receive antennas are utilized. For example, multiple spatial layers may transmit multiple data streams on a given frequency-time resource. The streams may be transmitted independently on separate antennas. Thus, in order to benefit from improved MIMO system performance, UCI may need to be multiplexed with data in PUSCH when there are multiple spatial layers for uplink.

Disclosure of Invention

The following presents a simplified summary of one or more embodiments in order to provide a basic understanding of such techniques and embodiments. This summary is not an extensive overview of all contemplated embodiments, and is intended to neither identify key or critical elements of all embodiments nor delineate the scope of any or all embodiments. Its sole purpose is to present some concepts of one or more embodiments in a simplified form as a prelude to the more detailed description that is presented later.

In one aspect, a method for wireless communication, comprising: determining Uplink Control Information (UCI); determining a number of symbols for the UCI on each of a plurality of layers based on a spectral resource parameter; multiplexing symbols for the UCI with data on each of the plurality of layers such that the symbols for the UCI are time-aligned on each of the plurality of layers; and transmitting the multiplexed symbols for the UCI with the data on the plurality of layers on an uplink.

In another aspect, an apparatus for wireless communication, comprising: means for determining Uplink Control Information (UCI); means for determining a number of symbols for the UCI on each of a plurality of layers based on a spectral resource parameter; means for multiplexing symbols for the UCI with data on each of the plurality of layers such that the symbols for the UCI are time-aligned on each of the plurality of layers; and means for transmitting the multiplexed symbols for the UCI with the data on the plurality of layers on an uplink.

In yet another aspect, an apparatus for wireless communication is disclosed that includes at least one processor. The at least one processor is configured to: determining Uplink Control Information (UCI); determining a number of symbols for the UCI on each of a plurality of layers based on a spectral resource parameter; multiplexing symbols for the UCI with data on each of the plurality of layers such that the symbols for the UCI are time-aligned on each of the plurality of layers; and transmitting the multiplexed symbols for the UCI with the data on the plurality of layers on an uplink. The apparatus also includes a memory coupled to the at least one processor.

In yet another aspect, a computer program product is disclosed that includes a non-transitory computer-readable medium having stored thereon computer-executable instructions. The instructions include: instructions for causing at least one computer to determine Uplink Control Information (UCI); instructions for causing the at least one computer to determine a number of symbols for the UCI on each of a plurality of layers based on a spectral resource parameter; instructions for causing the at least one computer to multiplex symbols for the UCI with data on each of the plurality of layers such that the symbols for the UCI are time-aligned on each of the plurality of layers; and instructions for causing the at least one computer to transmit the multiplexed symbols for the UCI with the data on the plurality of layers on an uplink.

In yet another aspect, a method for wireless communication, comprising: receiving a transmission comprising a plurality of coded modulation symbols for Uplink Control Information (UCI), wherein the plurality of coded modulation symbols for the UCI are multiplexed with data and transmitted by a User Equipment (UE) on a plurality of layers on an uplink such that the coded modulation symbols for the UCI are time-aligned on each of the plurality of layers and a number of the coded modulation symbols on each of the plurality of layers is based on a spectral resource parameter; and processing the received transmission to recover the UCI and data sent by the UE.

In yet another aspect, an apparatus for wireless communication, comprising: means for receiving a transmission comprising a plurality of coded modulation symbols for Uplink Control Information (UCI), wherein the plurality of coded modulation symbols for the UCI are multiplexed with data and transmitted on a plurality of layers on an uplink by a User Equipment (UE), wherein the coded modulation symbols for the UCI are time-aligned on each of the plurality of layers and a number of the coded modulation symbols on each of the plurality of layers is based on a spectral resource parameter; and means for processing the received transmission to recover the UCI and data sent by the UE.

In yet another aspect, an apparatus for wireless communication is disclosed that includes at least one processor. The at least one processor is configured to: receiving a transmission comprising a plurality of coded modulation symbols for Uplink Control Information (UCI), wherein the plurality of coded modulation symbols for the UCI are multiplexed with data and transmitted by a User Equipment (UE) on an uplink on a plurality of layers, wherein the coded modulation symbols for the UCI are time-aligned on each of the plurality of layers and a number of the coded modulation symbols on each of the plurality of layers is based on a spectral resource parameter; and processing the received transmission to recover the UCI and data sent by the UE.

In yet another aspect, a computer program product is disclosed that includes a non-transitory computer-readable medium having stored thereon computer-executable instructions. The instructions include: instructions for causing at least one computer to receive a transmission comprising a plurality of coded modulation symbols for Uplink Control Information (UCI), wherein the plurality of coded modulation symbols for the UCI are multiplexed with data and transmitted on a plurality of layers on an uplink by a User Equipment (UE), wherein the coded modulation symbols for the UCI are time-aligned on each of the plurality of layers and a number of the coded modulation symbols on each of the plurality of layers is based on a spectral resource parameter; and instructions for causing the at least one computer to process the received transmission to recover the UCI and data sent by the UE.

To the accomplishment of the foregoing and related ends, one or more aspects comprise the features hereinafter fully described and particularly pointed out in the claims. The following description and the annexed drawings set forth in detail certain illustrative aspects and are indicative of but a few of the various ways in which the principles of the aspects may be employed. Other advantages and novel features will become apparent from the following detailed description when considered in conjunction with the drawings and the disclosed aspects are intended to include all such aspects and their equivalents.

Drawings

The features, nature, and advantages of the present disclosure will become more apparent from the detailed description set forth below when taken in conjunction with the drawings in which like reference characters identify correspondingly throughout and wherein:

fig. 1 illustrates a multiple access wireless communication system according to one embodiment.

Fig. 2 shows a block diagram of a communication system.

Fig. 3 illustrates an exemplary frame structure for transmission in a wireless communication system.

Fig. 4 illustrates an exemplary subframe format for a downlink in a wireless communication system.

Fig. 5 illustrates an exemplary subframe format for an uplink in a wireless communication system.

Fig. 6 illustrates exemplary control and data multiplexing at multiple layers in a wireless communication system.

Fig. 7 is a flowchart representation of a process for wireless communication.

Fig. 8 is a block diagram representation of a portion of a wireless communication device.

Fig. 9 is a flowchart representation of a process for wireless communication.

Fig. 10 is a block diagram representation of a portion of a wireless communication device.

Fig. 11 is a block diagram representation of an exemplary transmission timeline in a wireless communication system.

Fig. 12 is a flowchart representation of a process for wireless communication.

Fig. 13 is a block diagram representation of a portion of a wireless communication device.

FIG. 14 illustrates an exemplary coupling of electronic components that facilitate multiplexing control and data across multiple layers according to an embodiment.

Detailed Description

Various aspects are now described with reference to the drawings. In the following description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of one or more aspects. It may be evident, however, that the various aspects may be practiced without these specific details. In other instances, well-known structures and devices are shown in block diagram form in order to facilitate describing these aspects.

The techniques described herein may be used for various wireless communication networks such as Code Division Multiple Access (CDMA) networks, Time Division Multiple Access (TDMA) networks, Frequency Division Multiple Access (FDMA) networks, orthogonal FDMA (ofdma) networks, single carrier FDMA (SC-FDMA) networks, and the like. The terms "network" and "system" are often used interchangeably. A CDMA network may implement a radio technology such as Universal Terrestrial Radio Access (UTRA), CDMA2000, etc. UTRA includes wideband-CDMA (W-CDMA) and Low Chip Rate (LCR). cdma2000 covers the IS-2000 standard, the IS-95 standard and the IS-856 standard. TDMA networks may implement wireless technologies such as global system for mobile communications (GSM). OFDMA networks may implement services such as evolved UTRA (E-UTRA), IEEE 802.11, IEEE802.16, IEEE 802.20, Flash-Etc. wireless technologies. UTRA, E-UTRA and GSM are part of the Universal Mobile Telecommunications System (UMTS). Long Term Evolution (LTE) is an upcoming release of UMTS that uses E-UTRA. UTRA, E-UTRA, GSM, UMTS, and LTE are described in documents from an organization entitled "third Generation partnership project" (3 GPP).

Single carrier frequency division multiple access (SC-FDMA) uses single carrier modulation and frequency domain equalization. The SC-FDMA signal has a low peak-to-average power ratio (PAPR) due to its inherent single carrier structure. SC-FDMA has attracted a high degree of attention, particularly in uplink communications where lower PAPR greatly benefits mobile terminals in terms of transmit power efficiency. In LTE, SC-FDMA is currently used for an uplink multiple access scheme.

It should be noted that for clarity, the subject matter is discussed below with respect to certain signal and message formats used in LTE. However, those skilled in the art will appreciate the application of the disclosed techniques to other communication systems and other signal transmission/reception techniques.

Fig. 1 illustrates a wireless communication system 100, which may be an LTE system or some other system. System 100 may include a plurality of evolved node bs (enbs) 110 and other network entities. An eNB may be an entity in communication with a UE and may also be referred to as a base station, a node B, an access point, etc. Each eNB 110 may provide communication coverage for a particular geographic area and may support communication for User Equipment (UE) located within the coverage area. To improve capacity, the entire coverage area of an eNB may be divided into multiple (e.g., three) smaller areas. Each smaller area may be served by a respective eNB subsystem. In 3GPP, the term "cell" can refer to the smallest coverage area of eNB 110 and/or an eNB subsystem serving that coverage area.

UEs 120 may be distributed throughout the system, and each UE 120 may be stationary or mobile. A UE may also be referred to as a mobile station, a terminal, an access terminal, a subscriber unit, a station, etc. The UE 120 may be a cellular phone, a Personal Digital Assistant (PDA), a wireless modem, a wireless communication device, a handheld device, a laptop computer, a cordless phone, a Wireless Local Loop (WLL) station, a smart phone, a netbook, a smartbook, a tablet, etc.

LTE uses Orthogonal Frequency Division Multiplexing (OFDM) on the downlink and single carrier frequency division multiplexing (SC-FDM) on the uplink. OFDM and SC-FDM divide a frequency range into multiple (K)_SMultiple) orthogonal subcarriers, which are also commonly referred to as tones, bins, etc. Each subcarrier may be modulated with data. Typically, modulation symbols are transmitted in the frequency domain using OFDM, while in timeModulation symbols are sent in the domain using SC-FDM. The interval between adjacent subcarriers may be fixed, and the total number of subcarriers (K)_S) May depend on the system bandwidth. For example, K for a system bandwidth of 1.4, 3, 5, 10, or 20 megahertz (MHz)_SMay be equal to 128, 256, 512, 1024 or 2048, respectively. The system bandwidth may be up to K in total_SA subset of the sub-carriers corresponds.

Fig. 2 shows a block diagram of an exemplary base station/eNB 110 and UE 120, and base station/eNB 110 and UE 120 may be one eNB and one UE in fig. 1. UE 120 may be equipped with T antennas 1234a through 1234T and base station 110 may be equipped with R antennas 1252a through 1252R, where T ≧ 1 and R ≧ 1 in general.

At UE 120, a transmit processor 1220 may receive data from a data source 1212 and control information from a controller/processor 1240. A transmit processor 1220 may process (e.g., encode, interleave, and symbol map) the data and control information and may provide data symbols and control symbols, respectively. Transmit processor 1220 may also generate one or more demodulation reference signals for multiple non-contiguous clusters based on one or more RS sequences assigned to UE 120 and may provide reference symbols. A Transmit (TX) multiple-input multiple-output (MIMO) processor 1230 may optionally perform spatial processing (e.g., precoding) on the data symbols, the control symbols, and/or the reference symbols from transmit processor 1220, and may provide T output symbol streams to T Modulators (MODs) 1232a through 1232T. Each modulator 1232 may process a respective output symbol stream (e.g., for SC-FDMA, OFDM, etc.) to obtain an output sample stream. Each modulator 1232 may further process (e.g., convert to analog, amplify, filter, and upconvert) the output sample stream to obtain an uplink signal. T uplink signals from modulators 1232a through 1232T may be transmitted via T antennas 1234a through 1234T, respectively.

At base station 110, antennas 1252a through 1252r may receive the uplink signals from UE 120 and provide received signals to demodulators (DEMODs) 1254a through 1254r, respectively. Each demodulator 1254 may condition (e.g., filter, amplify, downconvert, and digitize) a respective received signal to obtain received samples. Each demodulator 1254 may further process the received samples to obtain received symbols. A channel processor/MIMO detector 1256 may obtain received symbols from all R demodulators 1254a through 1254R. Channel processor 1256 may derive a channel estimate for a wireless channel from UE 120 to base station 110 based on a demodulation reference signal received from UE 120. MIMO detector 1256 may perform MIMO detection/demodulation on the received symbols based on the channel estimates and may provide detected symbols. A receive processor 1258 may process (e.g., symbol demap, deinterleave, and decode) the detected symbols, provide decoded data to a data sink 1260, and provide decoded control information to a controller/processor 1280.

On the downlink, at base station 110, data from a data source 1262 and control information from controller/processor 1280 may be processed by a transmit processor 1264, precoded by a TX MIMO processor 1266 as appropriate, conditioned by modulators 1254a through 1254r, and transmitted to UE 120. At UE 120, the downlink signals from base station 110 may be received by antennas 1234, conditioned by demodulators 1232, processed by a channel estimator/MIMO detector 1236, and further processed by a receive processor 1238 to obtain the data and control information sent to UE 120. Processor 1238 may provide the decoded data to a data sink 1239 and the decoded control information to a controller/processor 1240.

Controllers/processors 1240 and 1280 may direct operation at UE 120 and base station 110, respectively. Processor 1220, processor 1240, and/or other processors and modules at UE 120 may perform or direct process 700 in fig. 7, process 1200 in fig. 12, and/or other processes for the techniques described herein. Processor 1256, processor 1280, and/or other processors and modules at base station 110 may perform or direct process 900 in fig. 9 and/or other processes for the techniques described herein. Memories 1242 and 1282 may store data and program codes for UE 120 and base station 110, respectively. A scheduler 1284 may schedule UEs for downlink and/or uplink transmissions and may provide resource allocations (e.g., allocations of multiple non-contiguous clusters, RS sequences of demodulation reference signals, etc.) for the scheduled UEs.

Advances in digital communications have led to the use of multiple transmit antennas at the UE 120. For example, in LTE release 10, a single-user multiple-input multiple-output (SU-MIMO) mode is defined in which UE 120 can transmit up to two Transport Blocks (TBs) to eNB 110. TBs are sometimes also referred to as Codewords (CWs), but the mapping from TB to CW may sometimes be according to permutations, e.g. swapping two TBs mapped to a pair of CWs.

While concurrent PUCCH and PUSCH transmissions may be allowed when multiple layers exist for the uplink, it may still be desirable to multiplex UCI with data in PUSCH in certain circumstances when multiple layers exist for the uplink.

In UL MIMO operation of LTE release 10, when a UCI message is multiplexed on PUSCH with a rank greater than 1 (i.e., more than one layer), the message is replicated on all layers of two codewords and time-domain multiplexed with data such that UCI symbols are time-aligned on all layers, as discussed below in fig. 6. The UCI may include one or more of a hybrid automatic request acknowledgement (HARQ-ACK) message, a Resource Indicator (RI) message, a Channel Quality Indicator (CQI), a Precoding Matrix Indicator (PMI), or any information generally related to uplink control. While LTE release 10 allows concurrent PUCCH and PUSCH transmissions (where UCI may be sent in PUCCH and data may be sent in parallel with PUSCH) it may be desirable to multiplex UCI with data on PUSCH in some cases to avoid concurrent PUCCH and PUSCH transmissions. For example, if a UE has limited power headroom (power headroom) or if the requested UCI (e.g., CQI) is aperiodic, it may be desirable to multiplex UCI with data on PUSCH when multiple layers exist for the uplink. As discussed below in fig. 11-13, the number of coded modulation symbols for UCI may be determined based on one or more spectral resource parameters.

Fig. 3 shows an exemplary frame structure 300 for Frequency Division Duplex (FDD) in LTE. In other designs, the frame structure may include Time Division Duplex (TDD) in LTE. The transmission timeline for each of the downlink and uplink may be divided into units of radio frames. Each radio frame may have a predetermined duration (e.g., 10 milliseconds (ms)), and may be divided into 10 subframes with indices of 0 through 9. Each subframe may include two slots. Thus, each radio frame may include 20 slots with indices of 0 through 19. Each slot may include L symbol periods, e.g., seven symbol periods for a standard cyclic prefix (as shown in fig. 2) or six symbol periods for an extended cyclic prefix. Indexes 0 to 2L-1 may be allocated to 2L symbol periods in each subframe.

LTE uses OFDM on the downlink and SC-FDM on the uplink. OFDM and SC-FDM partition the system bandwidth into multiple (NFFT) orthogonal subcarriers, which are also commonly referred to as tones, bins, and so on. Each subcarrier may be modulated with data. Typically, modulation symbols are sent in the frequency domain using OFDM, while modulation symbols are sent in the time domain using SC-FDM. The spacing between adjacent subcarriers may be fixed, and the total number of subcarriers (NFFT) may depend on the system bandwidth. For example, NFFT may be equal to 128, 256, 512, 1024, or 2048 for system bandwidth of 1.4, 3, 5, 10, or 20 megahertz (MHz), respectively.

The time-frequency resources available for each of the downlink and uplink may be divided into resource blocks. Each resource block may cover 12 subcarriers in one slot and may include multiple resource units. Each resource element may cover one subcarrier in one symbol period and may be used to transmit one modulation symbol, where the modulation symbol may be a real or complex value. On the downlink, an OFDM symbol may be transmitted in each symbol period of a subframe. On the uplink, an SC-FDMA symbol may be transmitted in each symbol period of a subframe.

Fig. 4 shows two exemplary subframe formats 410 and 420 for the downlink with a standard cyclic prefix. Subframe format 410 may be for a base station equipped with two antennas. Cell-specific reference signals (CRSs) may be transmitted from antennas 0 and 1 in symbol periods 0, 4, 7, and 11. The reference signal is a signal known a priori by the transmitter and receiver and may also be referred to as a pilot. The CRS are cell-specific reference signals, e.g., generated based on cell Identification (ID). In fig. 4, for a resource unit with a label Ra, a modulation symbol may be transmitted on the resource unit from antenna a, and a modulation symbol may not be transmitted on the resource unit from other antennas. Subframe format 420 may be for a base station equipped with four antennas. The CRS may be transmitted from antennas 0 and 1 in symbol periods 0, 4, 7, and 11 and from antennas 2 and 3 in symbol periods 1 and 8. For both subframe formats 410 and 420, CRS may be transmitted on evenly spaced subcarriers, which may be determined based on cell ID. Different base stations may transmit their CRSs on the same or different subcarriers, depending on their cell IDs. For both subframe formats 410 and 420, resource elements not used for CRS may be used to transmit data (e.g., traffic data, control data, and/or other data).

For both subframe formats 410 and 420, a subframe may include a control region followed by a data region. The control region may include the first Q symbol periods of the subframe, where Q may be equal to 1, 2, 3, or 4. Q may vary from subframe to subframe and may be transmitted in the first symbol period of a subframe. The control region may carry control information. The data region may include the remaining 2L-Q symbol periods of the subframe and may carry data and/or other information for the UE.

The base station may transmit a Physical Control Format Indicator Channel (PCFICH), a physical hybrid ARQ indicator channel (PHICH), and a Physical Downlink Control Channel (PDCCH) in a control region of the subframe. The PCFICH may be transmitted in the first symbol period of the subframe, and may convey the size (Q) of the control region. The PHICH may carry Acknowledgement (ACK) and negative-acknowledgement (NACK) information for data transmission sent by the UE on the uplink using hybrid automatic repeat request (HARQ). The PDCCH may carry Downlink Control Information (DCI) for the UE. The base station may also transmit a Physical Downlink Shared Channel (PDSCH) in the data region of the subframe. The PDSCH may carry unicast data for individual UEs, broadcast data for groups of UEs, and/or broadcast data for all UEs.

Fig. 5 shows an exemplary format for the uplink in LTE. The resource blocks available for uplink may be divided into a data region and a control region. The control region may be formed at both edges of the system bandwidth and may have a configurable size. The data region may include all resource blocks not included in the control region. The design in fig. 5 results in the data region including contiguous subcarriers, which may allow a single UE to be assigned all of the contiguous subcarriers in the data region.

The UE may be assigned resource blocks in the control region for sending control information to the base station. The UE may also be assigned resource blocks in the data region for transmitting traffic data to the base station. The UE may transmit control information on the PUCCH using the allocated resource blocks 510a and 510b in the control region. The UE may transmit only traffic data or both traffic data and control information on the PUSCH using the allocated resource blocks 520a and 520b in the data region. As shown in fig. 5, the uplink transmission may span two slots of a subframe and may hop across frequency.

Fig. 6 illustrates exemplary control and data multiplexing at multiple layers in a wireless communication system. Fig. 6 illustrates multiplexing Uplink Control Information (UCI), such as CQI, ACK, or RI, with data mapped onto multiple layers, i.e., layer 0610 and layer 1620, for rank 2 PUSCH transmission. The horizontal axis of layers 610, 620 may represent SC-FDM symbols, while the vertical axis of layers 610, 620 may represent symbols of time domain modulation for each SC-FDM symbol. As shown in fig. 6, UCI may be mapped to all layers 610, 620 associated with all codewords, and UCI mapped to each layer may be time-domain aligned in each SC-FDM symbol. Alternatively or additionally, UCI may be mapped to all layers associated with a subset of all codewords, wherein the subset excludes at least one codeword. The coded modulation symbols for the UCI may be time division multiplexed with data prior to Discrete Fourier Transform (DFT) precoding.

In fig. 6, UCI information (i.e., CQI, ACK, and RI symbols) is time-domain aligned at each of the layers 610, 620. Accordingly, the UCI may be able to utilize the complete spatial channel. With reasonable implementation complexity, time-domain alignment on different layers enables close to optimal decoding of control information. In addition, decoding of UCI does not depend on decoding of data, so decoding delay can be minimized. Thus, when UCI is multiplexed with data in PUSCH, a time-domain modulation symbol is treated as one effective modulation symbol that experiences a complete spatial channel before DFT precoding from different spatial layers at the same time position, which provides robustness to UCI.

Fig. 6 also shows Reference Symbols (RSs) in the context of multiplexed UCI and data. For example, an ACK symbol may be disposed adjacent to the RS. As shown in fig. 6, in one example, the ACK symbols may not be aligned within each layer; however, since layer 1 is mirror symmetric (mirror) to layer 0, the ACK symbols are aligned on layers 610, 620.

The total number of coded symbols for UCI within each layer may be determined according to the total spectral efficiency of the MIMO channel. For example, for SU-MIMO transmission with rank R, it is assumed that MCS is employed₀To schedule codeword 0 and employ a Modulation Coding Scheme (MCS) MCS₁To schedule codeword 1, then the overall spectral efficiency f (MCS) should be based on₀)·R₀+f(MCS₁)·R₁To determine a total number of coded symbols Q' for the UCI, where R₀Represents the number of layers to which codeword 0 is mapped, R₁Representing the number of layers to which codeword 1 is mapped, and the function f (·) calculates the spectral efficiency of a particular MCS, and R ═ R₀+R₁. The steps of determining the number of coding symbols for UCI within each layer are further discussed below in fig. 11-13.

Fig. 7 is a flowchart representation of a wireless communication method 700. At block 702, UCI is determined, e.g., CQI/PMI, HARQ-ACK, RI, or any information typically related to uplink control is determined. At block 704, a number of symbols for the UCI on each of a plurality of layers is determined. For example, as discussed further below in fig. 11-13, the number of symbols for the UCI may be based on a spectral resource parameter, such as the spectral efficiency of the MIMO channel between the UE and the base station and/or the aggregate spectral efficiency over all layers. At block 706, the symbols for the UCI are multiplexed with data on each layer such that the symbols for the UCI are time aligned on each layer. UCI may be mapped to all layers associated with all codewords, and UCI mapped to each layer may be time-domain aligned in each SC-FDM symbol. For example, the symbols of the UCI may be mapped to the same set of at least one symbol position on each layer in each symbol period (e.g., in each SC-FDM/OFDM symbol period). The coded modulation symbols for the UCI may also be time division multiplexed with data prior to DFT precoding. For example, symbols for UCI may be time division multiplexed with modulation symbols for data on each layer, and then a DFT may be performed on the multiplexed modulation symbols for UCI and data for each layer in each symbol period (e.g., in each SC-FDM/OFDM symbol period). At block 708, symbols for UCI multiplexed with data on each layer may be transmitted on the uplink.

Fig. 8 is a block diagram representation of a portion of a wireless communication device 800. Module 802 is used to determine UCI, e.g., determine CQI/PMI, HARQ-ACK, RI, or any information typically related to uplink control. The module 804 is for determining a number of symbols for UCI on each of a plurality of spatial layers. For example, as discussed in fig. 11-13, the number of symbols for UCI may be based on spectral resource parameters. The module 806 is configured to multiplex the symbols for UCI with data on each layer such that the symbols for UCI are time aligned on each layer. A module 808 is configured to transmit symbols for UCI multiplexed with data on the layers on the uplink. The communication apparatus 800, the modules 802, and the modules 804 may also be configured to implement other functions and features discussed herein.

Fig. 9 is a flowchart representation of a wireless communication method 900. At block 902, a transmission comprising a plurality of encoded modulation symbols for UCI multiplexed with data is received. For example, UCI multiplexed with data may be transmitted by the UE on multiple layers on the uplink, e.g., on all layers associated with all codewords, or on all layers associated with a subset of all codewords. The coded modulation symbols for the UCI may be time-aligned on each layer, and the number of coded modulation symbols on each layer may be based on spectral resource parameters, such as spectral efficiency of the MIMO channel between the UE and the base station and/or aggregate spectral efficiency over all layers, as discussed further below in fig. 11-13. At block 904, the received transmission is processed to recover the UCI and data sent by the UE. For example, an Inverse Discrete Fourier Transform (IDFT) may be performed for the received transmission in each symbol period to obtain multiplexed modulation symbols for UCI and data for each layer. The multiplexed modulation symbols may then be time division demultiplexed to obtain modulation symbols for UCI and modulation symbols for data for each layer.

Fig. 10 is a block diagram representation of a portion of a wireless communication device 1000. Module 1002 is configured to receive a transmission comprising a plurality of encoded modulation symbols for UCI multiplexed with data. For example, the UCI multiplexed with data may be transmitted by the UE on multiple layers on the uplink. The coded modulation symbols for the UCI may be time aligned on each layer, and the number of coded modulation symbols on each layer may be based on the spectral resource parameter. Module 1004 is configured to process the received transmission to recover UCI and data sent by the UE.

Fig. 11 is a block diagram representation of an exemplary timeline for transmission on a horizontal axis 1100, with the horizontal axis 1100 representing linearly increasing time. As discussed previously, the number of coded modulation symbols for UCI on each layer may be determined based on one or more spectral efficiency parameters. For example, in case of a single β value, the number of UCI symbols on each CW and each layer for HARQ-ACK/RI may be determined according to the following equation:

formula (1)

Table 1 lists the various parameters used in formula (1).

TABLE 1

In equation (1), the initial PUSCH transmission parameter may be used as the initial transmission spectral efficiency target (fixed block error rate (BLER)), taking into account the offsetThis may then result in a well controlled BLER for UCI information.

However, in some cases, the calculation accuracy of the number of coded modulation symbols Q' may be improved. For example, when the UL grant from the enodeb 110 simultaneously schedules new transmission of two transport blocks, the formula for calculating the number of UCI symbols on each CW and each layer for HARQ-ACK or RI shown in equation (1) works exactly because the two TBs have the same transmission bandwidth within their respective initial grants. However, as explained further below, the following is also possible: one UL grant may schedule two TBs whose initial grants are not synchronized, in which case the computation of Q' may be improved.

For example, at time t1, the PDCH may be used to schedule transmissions 1102, 1104 for transport block TB0 and TB 1. Without loss of generality, it is assumed that the transmission at time t1 occupies 10 Resource Blocks (RBs). In some cases, at time t2, the transmission may be repeated due to changes in the channel (blocks 1106, 1108). For example, the PHICH may trigger non-adaptive retransmissions of TB0 and TB 1. For example, the transmissions 1106, 1108 may also have 10 RBs as their initial bandwidth. However, when HARQ-ACK is multiplexed with PUSCH at time t3, the initial transmission bandwidth is different for the two scheduled TBs 1110 and 1114 (e.g., 6 RBs for TB1 and still 10 RBs for TB 2).

Alternatively, the bandwidth calculations for TB0 and TB1 may be different at time t3, and if a Sounding Reference Signal (SRS) is transmitted at time t1, the number of data SC-FDM symbols available for initial transmission of the two TBs will be different at time t3 (because one symbol is used for SRS at time t 1). Thus, for initial transmission and retransmission of a transport block, in the counter of equation (1)The variables may be different.

Thus, when the initial Uplink (UL) grants for the two TBs are not scheduled simultaneously, it may be necessary as to how to select the parameters in equation (1)Andand (4) guiding.

For example, the following modified formula may determine the number of UCI symbols on each CW and each layer for HARQ-ACK/RI instead of equation (1):

formula (2)

In the formula (2), the reaction mixture is,represents the bandwidth scheduled in the initial grant for TBx (x =0, 1), andindicating TBx the number of SC-FDMA symbols per subframe of the initial PUSCH transmission.

As may be apparent, the denominator in equation (2) attempts to calculate the aggregate spectral efficiency over all spatial layers from the individual initial grants for each scheduled TB individually.

It can be seen that equation (2) degenerates to equation (1) when the two TBs are scheduled for their initial transmission simultaneously.

It is further clear that equation (2) can be equivalently rewritten as:

<math> <mrow> <msup> <mi>Q</mi> <mo>′</mo> </msup> <mo>=</mo> <mi>max</mi> <mo>[</mo> <mi>min</mi> <mrow> <mo>(</mo> <msubsup> <mi>Q</mi> <mi>temp</mi> <mo>′</mo> </msubsup> <mo>,</mo> <mn>4</mn> <mo>·</mo> <msubsup> <mi>M</mi> <mi>sc</mi> <mi>PUSCH</mi> </msubsup> <mo>)</mo> </mrow> <mo>,</mo> <msubsup> <mi>Q</mi> <mi>min</mi> <mo>′</mo> </msubsup> <mo>]</mo> </mrow> </math>

formula (3)

Wherein,

formula (4)

During operation, UE 120 may occasionally miss receiving and using UL grants. Thus, when estimating the number of coded modulation symbols used to transmit the HARQ-ACK or RI, the eNB 110 may have to consider a number of possible reasons for retransmission, including the UE 120 missing a grant. In considering various possible scenarios of retransmission to the UE 120, to reduce the number of hypotheses to be tested at the eNB 110, the following method of reducing computational complexity may be employed:

TABLE 2 methods for complexity reduction

Note that:

<math> <mrow> <msub> <mi>A</mi> <mn>0</mn> </msub> <mo>:</mo> <mo>=</mo> <mfrac> <mn>1</mn> <mrow> <msubsup> <mi>M</mi> <mi>sc</mi> <mrow> <mi>PUSCH</mi> <mo>-</mo> <mi>initial</mi> <mrow> <mo>(</mo> <mn>0</mn> <mo>)</mo> </mrow> </mrow> </msubsup> <mo>·</mo> <msubsup> <mi>N</mi> <mi>symb</mi> <mrow> <mi>PUSCH</mi> <mo>-</mo> <mi>initial</mi> <mrow> <mo>(</mo> <mn>0</mn> <mo>)</mo> </mrow> </mrow> </msubsup> </mrow> </mfrac> <mo>,</mo> </mrow> </math>

<math> <mrow> <msub> <mi>A</mi> <mn>1</mn> </msub> <mo>:</mo> <mo>=</mo> <mfrac> <mn>1</mn> <mrow> <msubsup> <mi>M</mi> <mi>sc</mi> <mrow> <mi>PUSCH</mi> <mo>-</mo> <mi>initial</mi> <mrow> <mo>(</mo> <mn>1</mn> <mo>)</mo> </mrow> </mrow> </msubsup> <mo>·</mo> <msubsup> <mi>N</mi> <mi>symb</mi> <mrow> <mi>PUSCH</mi> <mo>-</mo> <mi>initial</mi> <mrow> <mo>(</mo> <mn>1</mn> <mo>)</mo> </mrow> </mrow> </msubsup> </mrow> </mfrac> <mo>,</mo> </mrow> </math>

representing the first and second spectral resource parameters calculated based on the initially scheduled transmissions of TB0 and TB 1.

Further, the number of coded modulation symbols for CQI on each layer may be determined by:

the CQI information may be multiplexed on fewer than all TBs used for data transmission. For example, the CQI may be multiplexed on all layers of one of the TBs used for data transmission. However, even in this case, the system can ensure that UCI symbols are time-aligned on all layers to which the UCI symbols are mapped.

Fig. 12 is a flow chart 1200 of a wireless communication process. At block 1202, a first spectral resource parameter is calculated based on an initially scheduled spectral allocation for a first transport block. At block 1204, a second spectrum resource parameter is calculated based on the initially scheduled spectrum allocation for the second transport block. At block 1206, a number of symbols (e.g., coded modulation symbols) for the UCI on each layer is determined using the first and second spectral resource parameters, e.g., by using equation (2) discussed above. The determined number of coded modulation symbols may be mapped to each layer. For example, if it is determined at operation 1206 that the number of coded modulation symbols is x, then x coded modulation symbols may be mapped to each layer.

Fig. 13 is a block diagram representation of a wireless communication device comprising: a module 1302 for calculating a first spectral resource parameter based on an initially scheduled spectral allocation for a first transport block; a module 1304 for calculating a second spectrum resource parameter based on the initially scheduled spectrum allocation for the second transport block; and a module 1306 for determining a number of symbols (e.g., coded modulation symbols) for UCI on each of the plurality of layers using the first and second spectral resource parameters, e.g., by using equation (2) discussed above. The number of coded modulation symbols may be mapped to each layer. For example, if module 1306 determines that there should be x coded modulation symbols for UCI, then x coded modulation symbols for UCI may be mapped to each layer.

Referring next to fig. 14, illustrated is a system 1400 that facilitates multiplexing control and data across multiple layers in accordance with an embodiment. System 1400 includes functional blocks that can represent functions implemented by a processor, software, or combination thereof (e.g., firmware), where system 1400 includes a logical combination of electronic components 1402 that can act in conjunction. As shown, logical grouping 1402 may include: an electronic component 1410 for determining UCI; and an electronic component for determining a number of symbols for UCI on each of the plurality of layers. For example, the number of symbols for UCI may be based on spectral resource parameters. Logical grouping 1402 may further include: multiplexing symbols for UCI with data on each layer such that the symbols for UCI are time-aligned electronic components on each layer. Further, logical grouping 1402 may include: an electronic component for transmitting the multiplexed symbols for UCI with data on the uplink on these layers. Additionally, system 1400 can include a memory 1420, memory 1420 that retains instructions for executing functions associated with electrical components 1410, 1412, 1414, and 1416, wherein any of electrical components 1410, 1412, 1414, and 1416 can reside within or outside of memory 1420.

It is to be understood that the specific order or hierarchy of steps in the processes disclosed is an example of exemplary approaches. It is understood that the specific order or hierarchy of steps in the processes may be rearranged depending upon design preferences, while remaining within the scope of the present disclosure. The accompanying method claims present elements of the various steps in a sample order, and are not meant to be limited to the specific order or hierarchy presented.

Those of skill in the art would understand that information and signals may be represented using any of a variety of different technologies and techniques. For example, data, instructions, commands, information, signals, bits, symbols, and chips that may be referenced throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.

The word "exemplary" is used herein to mean serving as an example, instance, or illustration. Any aspect or design described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other aspects or designs.

It will be further appreciated by those of skill in the art that the various illustrative logical blocks, modules, circuits, and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both. To clearly illustrate this interchangeability of hardware and software, various illustrative components, blocks, modules, circuits, and steps have been described above generally in terms of their functionality. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the overall system. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present disclosure.

The various illustrative logical blocks, modules, and circuits described in connection with the embodiments disclosed herein (e.g., identifiers, assigners, transmitters, and distributors) may be implemented or performed with a general purpose processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. A general-purpose processor may be a microprocessor, but, in the alternative, the processor may be any conventional processor, controller, microcontroller, or state machine. A processor may also be implemented as a combination of computing devices, e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration.

In one or more exemplary embodiments, the functions described may be implemented in hardware, software, firmware, or any combination thereof. If implemented in software, the functions may be stored on or encoded in a computer-readable medium as one or more instructions or code. Computer readable media includes computer storage media. A storage media may be any available media that can be accessed by a computer. By way of example, and not limitation, such computer-readable media can comprise RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer. Disk and disc, as used herein, includes Compact Disc (CD), laser disc, optical disc, Digital Versatile Disc (DVD), floppy disk and blu-ray disc where disks usually reproduce data magnetically, while discs reproduce data optically with lasers. Combinations of the above should also be included within the scope of computer-readable media.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present disclosure. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the disclosure. Thus, the present disclosure is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for wireless communication, comprising:

determining Uplink Control Information (UCI);

determining a number of symbols for the UCI on each of a plurality of layers based on a spectral resource parameter;

multiplexing symbols for the UCI with data on each of the plurality of layers such that the symbols for the UCI are time-aligned on each of the plurality of layers; and

transmitting the multiplexed symbols for the UCI with the data on the plurality of layers on an uplink,

wherein determining the number of symbols for the UCI on each of the plurality of layers based on the spectral resource parameters comprises: determining the number of symbols for the UCI on each of the plurality of layers based on:

wherein Q ' represents the number of symbols for UCI, Q ', on each of the plurality of layers '_minRepresenting a minimum number of symbols for UCI on each of the plurality of layers, O representing a number of hybrid automatic repeat request (HARQ) data Acknowledgement (ACK) bits or a number of Rank Indicator (RI) bits,indicates an offset, C, configured by a higher layer^(x)Indicates the number of code blocks of a Transport Block (TB) x,representing the number of bits of a code block r in said Transport Block (TB) x,indicates an initially scheduled bandwidth for a Transport Block (TB) x, which is expressed as a number of subcarriers,represents a scheduling bandwidth for a current physical uplink shared channel, PUSCH, in units of subcarriers, andrepresents the number of single carrier frequency division multiplexing (SC-FDM) symbols in a subframe of an initial PUSCH transmission for a Transport Block (TB) x.

2. The method of claim 1, wherein multiplexing the symbols for the UCI with data on each of the plurality of layers comprises:

time-division multiplexing the symbols for the UCI with modulation symbols for the data on each of the plurality of layers, an

Performing a Discrete Fourier Transform (DFT) on the multiplexed modulation symbols for the UCI and data for each of the plurality of layers in each symbol period.

3. The method of claim 2, wherein each symbol period comprises: single carrier frequency division multiplexing (SC-FDM)/Orthogonal Frequency Division Multiplexing (OFDM) symbol periods.

4. The method of claim 1, wherein multiplexing the symbols for the UCI with data on each of the plurality of layers comprises:

in each symbol period, mapping the symbols for the UCI to a same set of at least one symbol position on each of the plurality of layers.

5. The method of claim 1, wherein the spectrum resource parameters comprise: spectral efficiency of a multiple-input multiple-output (MIMO) channel between a User Equipment (UE) and a base station.

6. The method of claim 1, wherein the spectrum resource parameters comprise: an aggregate spectral efficiency over all of the plurality of layers.

7. The method of claim 1, wherein determining the number of symbols for the UCI on each of the plurality of layers based on the spectral resource parameters comprises:

calculating a first spectral resource parameter based on an initially scheduled spectral allocation for a first transport block;

calculating a second spectrum resource parameter based on the initially scheduled spectrum allocation for the second transport block; and

determining the number of symbols for the UCI on each of the plurality of layers using the first and second spectral resource parameters.

8. The method of claim 7, wherein the symbols for the UCI comprise coded modulation symbols.

9. The method of claim 1, wherein the UCI comprises one of a Channel Quality Indicator (CQI), an Acknowledgement (ACK), a Rank Indicator (RI), and a combination thereof.

10. The method of claim 1, wherein the plurality of layers comprises all layers associated with all codewords.

11. The method of claim 1, wherein the plurality of layers comprises all layers associated with a subset of all codewords, wherein the subset of all codewords excludes at least one of the codewords.

12. An apparatus for wireless communication, comprising:

means for determining uplink control information, UCI;

means for determining a number of symbols for the UCI on each of a plurality of layers based on a spectral resource parameter;

means for multiplexing symbols for the UCI with data on each of the plurality of layers such that the symbols for the UCI are time-aligned on each of the plurality of layers; and

means for transmitting multiplexed symbols for the UCI with the data on the plurality of layers on an uplink,

wherein the means for determining a number of symbols for the UCI on each of the plurality of layers based on the spectral resource parameters comprises: means for determining the number of symbols for the UCI on each of the plurality of layers based on:

wherein Q' represents for UCI on each of the plurality of layersThe number of symbols, Q'_minRepresenting a minimum number of symbols for UCI on each of the plurality of layers, O representing a number of hybrid automatic repeat request (HARQ) data Acknowledgement (ACK) bits or a number of Rank Indicator (RI) bits,indicates an offset, C, configured by a higher layer^(x)Indicates the number of code blocks of a Transport Block (TB) x,representing the number of bits of a code block r in said Transport Block (TB) x,indicates an initially scheduled bandwidth for a Transport Block (TB) x, which is expressed as a number of subcarriers,represents a scheduling bandwidth for a current physical uplink shared channel, PUSCH, in units of subcarriers, andrepresents the number of single carrier frequency division multiplexing (SC-FDM) symbols in a subframe of an initial PUSCH transmission for a Transport Block (TB) x.

13. The apparatus of claim 12, wherein the means for multiplexing the symbols for the UCI with data on each of the plurality of layers comprises:

means for time-division multiplexing the symbols for the UCI with modulation symbols for the data on each of the plurality of layers, an

Means for performing a Discrete Fourier Transform (DFT) on the multiplexed modulation symbols for the UCI and data for each of the plurality of layers in each symbol period.

14. The apparatus of claim 13, wherein each symbol period comprises: single carrier frequency division multiplexing (SC-FDM)/Orthogonal Frequency Division Multiplexing (OFDM) symbol periods.

15. The apparatus of claim 12, wherein the means for multiplexing the symbols for the UCI with data on each of the plurality of layers comprises:

means for mapping the symbols for the UCI to a same set of at least one symbol position on each of the plurality of layers in each symbol period.

16. The apparatus of claim 12, wherein the spectrum resource parameters comprise: spectral efficiency of a multiple-input multiple-output (MIMO) channel between a User Equipment (UE) and a base station.

17. The apparatus of claim 12, wherein the spectrum resource parameters comprise: an aggregate spectral efficiency over all of the plurality of layers.

18. The apparatus of claim 12, wherein the means for determining a number of symbols for the UCI on each of the plurality of layers based on spectral resource parameters comprises:

means for calculating a first spectral resource parameter based on an initially scheduled spectral allocation for a first transport block;

means for calculating a second spectrum resource parameter based on an initially scheduled spectrum allocation for a second transport block; and

means for determining the number of symbols for the UCI on each of the plurality of layers using the first spectral resource parameter and the second spectral resource parameter.

19. The apparatus of claim 18, wherein the symbols for the UCI comprise coded modulation symbols.

20. The apparatus of claim 12, wherein the UCI comprises one of a Channel Quality Indicator (CQI), an Acknowledgement (ACK), a Rank Indicator (RI), and a combination thereof.

21. The apparatus of claim 12, wherein the plurality of layers comprises all layers associated with all codewords.

22. The apparatus of claim 12, wherein the plurality of layers comprises all layers associated with a subset of all codewords, wherein the subset of all codewords excludes at least one of the codewords.

23. A method for wireless communication, comprising:

receiving a transmission comprising a plurality of coded modulation symbols for uplink control information, UCI, wherein the plurality of coded modulation symbols for the UCI are multiplexed with data and transmitted by a User Equipment (UE) on an uplink on a plurality of layers such that the coded modulation symbols for the UCI are time-aligned on each of the plurality of layers and a number of the coded modulation symbols on each of the plurality of layers is based on a spectral resource parameter; and

process the received transmission to recover the UCI and data sent by the UE,

wherein the number of the encoded modulation symbols for the UCI on each of the plurality of layers is determined based on:

24. The method of claim 23, wherein processing the received transmission comprises:

performing an Inverse Discrete Fourier Transform (IDFT) on the received transmission in each symbol period to obtain, for each of the plurality of layers, a multiplexed modulation symbol for the UCI and data, an

Time-division demultiplexing the multiplexed modulation symbols to obtain modulation symbols for the UCI and modulation symbols for the data for each of the plurality of layers.

25. The method of claim 23, wherein the spectrum resource parameters comprise: spectral efficiency of a multiple-input multiple-output (MIMO) channel between a User Equipment (UE) and a base station.

26. The method of claim 23, wherein the spectrum resource parameters comprise: an aggregate spectral efficiency over all of the plurality of layers.

27. The method of claim 23, wherein the UCI comprises one of a Channel Quality Indicator (CQI), an Acknowledgement (ACK), a Rank Indicator (RI), and a combination thereof.

28. The method of claim 23, the plurality of layers comprising all layers associated with all codewords.

29. The method of claim 23, wherein the plurality of layers comprises all layers associated with a subset of all codewords, wherein the subset of all codewords excludes at least one of the codewords.

30. An apparatus for wireless communication, comprising:

means for receiving a transmission comprising a plurality of coded modulation symbols for Uplink Control Information (UCI), wherein the plurality of coded modulation symbols for the UCI are multiplexed with data and transmitted by a User Equipment (UE) on an uplink on a plurality of layers, wherein the coded modulation symbols for the UCI are time-aligned on each of the plurality of layers and a number of the coded modulation symbols on each of the plurality of layers is based on a spectral resource parameter; and

means for processing the received transmission to recover the UCI and data sent by the UE,

wherein Q ' represents the number of symbols for UCI, Q ', on each of the plurality of layers '_minRepresenting symbols for UCI on each of the plurality of layersO denotes the number of hybrid automatic repeat request (HARQ) data Acknowledgement (ACK) bits or the number of Rank Indicator (RI) bits,indicates an offset, C, configured by a higher layer^(x)Indicates the number of code blocks of a Transport Block (TB) x,representing the number of bits of a code block r in said Transport Block (TB) x,indicates an initially scheduled bandwidth for a Transport Block (TB) x, which is expressed as a number of subcarriers,represents a scheduling bandwidth for a current physical uplink shared channel, PUSCH, in units of subcarriers, andrepresents the number of single carrier frequency division multiplexing (SC-FDM) symbols in a subframe of an initial PUSCH transmission for a Transport Block (TB) x.

31. The apparatus of claim 30, wherein the means for processing the received transmission comprises:

means for performing an Inverse Discrete Fourier Transform (IDFT) on the received transmission in each symbol period to obtain multiplexed modulation symbols for the UCI and data for each of the plurality of layers, and

means for time-division demultiplexing the multiplexed modulation symbols to obtain modulation symbols for the UCI and modulation symbols for the data for each of the plurality of layers.

32. The apparatus of claim 30, wherein the spectrum resource parameters comprise: spectral efficiency of a multiple-input multiple-output (MIMO) channel between a User Equipment (UE) and a base station.

33. The apparatus of claim 30, wherein the spectrum resource parameters comprise: an aggregate spectral efficiency over all of the plurality of layers.

34. The apparatus of claim 30, wherein the UCI comprises one of a Channel Quality Indicator (CQI), an Acknowledgement (ACK), a Rank Indicator (RI), and a combination thereof.

35. The apparatus of claim 30, wherein the plurality of layers comprises all layers associated with all codewords.

36. The apparatus of claim 30, wherein the plurality of layers comprises all layers associated with a subset of all codewords, wherein the subset of all codewords excludes at least one of the codewords.